Bi · bismuth

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Takeaway

Recommended or revised 10 times between 1902 and 2024 (first record 1902, latest revision 2005).
Of 4 revisions whose previous recommendation had an uncertainty, 1 (1971) put the new value outside the previous (expanded) range.
The current standard atomic weight is 208.980 40(1) (recommended in 2005).

Relative deviation from the current (or last) value, symmetric-log axis. Bars: uncertainty (expanded range); open circles: no uncertainty; orange boxes: intervals.

Yearyear of the recommendation	Value (as printed)as printed in CIAAW's table; digits in parentheses are the uncertainty (expanded range) in the last digits	Notationvalue(uncertainty), interval or no uncertainty	Scalebefore 1961 oxygen = 16, from 1961 ¹²C = 12	Value, ¹²C scalepre-1961 values multiplied by 15.9994/16	z vs previous(new − previous) ÷ previous uncertainty	ReportDOI of the CIAAW report
1902	208.5	no uncertainty	O=16	208.49218125		10.1007/BF01370337
1907	208.0	no uncertainty	O=16	207.9922		10.1021/ja01956a001
1922	209.0	no uncertainty	O=16	208.9921625		10.1021/ja01441a001
1925	209.00	no uncertainty	O=16	208.9921625		10.1039/CT9252700913
1961	208.980	no uncertainty	12C=12	208.98		10.1021/ja00881a001
1969	208.9806(1)	value(uncertainty)	12C=12	208.9806		10.1351/pac197021010091
1971	208.9804(1)	value(uncertainty)	12C=12	208.9804	−2.000	10.1351/pac197230030637
1985	208.980 37(3)	value(uncertainty)	12C=12	208.98037	−0.300	10.1351/pac198658121677
1995	208.980 38(2)	value(uncertainty)	12C=12	208.98038	0.333	10.1351/pac199668122339
2005	208.980 40(1)	value(uncertainty)	12C=12	208.9804	1.000	10.1351/pac200678112051

Source: Standard atomic weights © IUPAC/CIAAW 2016–2024. Commission on Isotopic Abundances and Atomic Weights, Historical changes of standard atomic weights (compiled by J. Meija), https://www.ciaaw.org/historical-atomic-weights.htm